Please Note:
Power circuits contains schematics relating to power supplies, battery chargers, voltage and current monitors. All circuits are listed alphabetically on the Circuit Index page and in date order on the update page. All contributors are listed on the credits page.

If you have problems try my help page first. Most circuits on this site use SI Notation. Due to large volumes of email, I regret that I can only answer questions about circuits on my site.

For help or to contribute please email me
  1. Gyrator Circuit
  2. L200 PSU
  3. 12 Volt 30amp Supply
  4. Regulated 12 Volt Supply by Mick Devine
  5. Fuse Blown Indicator
  6. Unregulated Power Supply
  7. Dual Regulated Power Supply
  8. Boosting Regulator Current
  9. Logic PSU with Over Voltage Protection
  10. Nicad Battery Charger
  11. PIC Nicad Battery Charger External link to Peter Hayles Site
  12. Variable Power Supply
  13. Transformerless Power Supply by Ron J
  14. Universal DC-DC Converter
  15. Variable Regulator Output by Ron J
  16. LM317 Regulator Circuit by Matthew Hewson
  17. Basic UPS
  18. Over Voltage Protection for LM317
  19. Alarm PSU by Ron J
  20. An Output Adjustable Flyback Converter by Simon Oh
  21. A 13.8V 20A PSU by Bob
  22. A 9V 2A PSU
  23. Current Limiting Power Supply by Ron J
  24. Supply Voltage Indicator by Miroslav Adzic
  25. Small Variable Power Supply by Miroslav Adzic
  26. Soft Start power Supply by Miroslav Adzic
  27. Universal PSU By Volker Jeschkeit
  28. Add-On Current Limiter by Ron J
  29. 1.3V Power Supply
  30. Variable Power supply by David Celestin
  31. Fast Electronic Fuse by Miroslav Adzic
  32. Adjustable Power Supply with Charger by Milardo de Guzman
  33. Multiple Output DC Converter
  34. 12 Volt 20 Amp Power Supply
  35. Power Fail Alert
  36. Power Zener Circuit
  37. Variable 37 Volt 30 Amp Supply by Max
  38. RF Friendly PSU
  39. EMI Mains Filter
  40. Under Voltage Circuit
  41. Solar Battery Charger
  42. Adjustable Constant Current Load External Link to Paulo Renato's Site
  43. Constant Current Load External Link to Jeff K. Steinkamp N7YG
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